Machine for reducing vulcanized rubber to powder.



T. GARE.

MACHINE FOR REDUCING VULCANIZED RUBBER T0 POWDER.

APPLICATION FILED DEC. 3, 1909.

Patented Au 30, 1910.

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T. GARE.

MACHINE FOR REDUCING VULGANIZED RUBBER T0 POWDER.

APPLICATION IILED DEC. 3, 1909.

Patehted Aug. 30, 1910.

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T. GARE.

MACHINE FOR REDUCING VULGANIZED RUBBER T0 POWDER.

APPLICATION FILED DEC. 3, 1909.

Patented Aug. 30, 1910.

3 SHEETS-8HEET 3.

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UNITED STATES PATENT OFFICE.

THOMAS GARE, 0F BRAMBLE BEACH, NEW BRIGHTON, ENGLAND.

MACHINE FOR REDUCING VULCANIZED RUBBER TO POWDER.

T 0 all whom it may concern:

Be it known that I, THOMAS GARE, a subject of the King of Great Britain, residing at Bramble Beach, Varren Drive, New Brighton, in the county of Chester, England, engineer, have invented certain new and useful Improvements in Machines for Reducing Vulcanized Rubber to Powder, of which the following is a specification.

This invention has for its object the construction of a machine specially adapted for simultaneously grinding to a fine powder any desired number of pieces of vulcanized rubber of any length or section, say such as old wheel tires, each piece having its own automatic feed. And in order that my invent-ion may be more fully understood I have caused to be appended hereunto drawings marked with letters of reference inclicating like parts in the various figures showing a machine constructed in accordance with my invention.

Figure 1 is an end view, Fig. 2 a side view of the machine complete, Fig. 3 is a detached sectional side view of Fig. 1 with the cover removed and Fig. 4: a cross section of the cylinder of the machine.

In carrying out my invention and referring to the figures generally, I mount in suitable bearings a in a casing Z) made in halves, a rotating cylinder (Z having a raspor graterlike surface or covering 6 which forms the grinding medium. The lower half of said casing constitutes a stand 0. The said cylinder may take the form of a wide pulley and the said raspor gratersurface or covering 6 consists of stabbed sheet steel suitably secured around the said pulley. For instance I may slit the rim of the pulley at f and employ a stabbed sheet steel coveringe which is sufliciently long to allow of its ends being drawn down the slit f and, by a suitable tensioning device, secured to the boss 9 of the pulley (Z, see more particularly Fig. 4. The said tensioning device may consist of two-part rods h at one end pivoted to plates 1' gripping the ends of the said stabbed sheet steel covering 6, and at the other end secured to the boss 9 of the pulley, and connected together by a turn-buckle 75, so as to allow of being lengthened and shortened. By this means the stabbed sheet steel surface or covering 6 can be readily removed when worn and replaced even withoutremoving the cylinder or pulley (Z from its bearings.

At the side of the cylinder or pulley cl I l Specification of Letters Patent.

Application filed December 3, 1909.

Patented Aug. 30, 1910.

Serial No. 531,255.

employ upon the bottom half of the casing b a narrow table Z, see Fig. 3, and in front thereof a spiked feed roller m, both extending along the whole width of the cylinder or pulley cl. Above this roller I employ a frame a, see also Figs. 1 and 2, so supported at each end and in a bracket' 0 as to allow of it being vertically adjusted. This frame also extends along the whole width of the cylinder or pulley (Z and may be vertically adjustable by means of pins p passing through holes 9 in the said frame and brackets.

In the frame a are mounted side by side a suitable number of presser feet r means being provided in connection with said feet for forcing the same downwardly. In the construction illustrated, said means are in the form of springs 8. Each foot is provided at its lower end with a wheel 6 lineal with the feed roller m. The wheels t together with the roller m, form an automatic sectional feed for the rubber piece to be ground, a piece of rubber 2 being placed below each presser foot upon the roller m which latter feeds them jointly against the said grinding surface 6. Each of the said presser feet at the top is furnished with a pin 3 which prevents it from dropping too far. Each pressure foot is also provided with a hole 4 for the insertion of a pin by means of which it can be raised when it is desired to place a piece of rubber in feeding position. Other suitable means may however be provided for this purpose.

The roller m may be actuated in any suitable manner, as, for instance, by suitable gearing, such as shown in the drawings, consisting of a ratchet wheel a secured to the end of the roller m, a cam 11 secured on the cylinder shaft w, and a lever 00 fulcrumed to the said roller end, the inner end of which lever is actuated by the said cam and the outer end provided with a pawl y engaging in the teeth of the said ratchet wheel u. Any suitable externally located means, as for instance, the drive pulleys 2, may be employed for rotating shaft to.

Each time the inner end of the lever 00 is depressed by the cam 12, the pawl y turns the wheel at slightly, and the roller m feeds and compresses the rubber against the rasp or graterlike surface 0, while when the cam operated end of the lever a: rises, the pawl 3 releases the wheel to, whereupon the rubber, being thereby relieved from forward pressure, will expand and turn the roller m backward sufficiently to bring the rubber slightly out of contact with the rasp or grater like surface 6. Air is thereupon free to pass between the rubber and said surface, so as to momentarily cool both and thus prevent the rubber from being burned.

The ground rubber drops into the casing b and leaves it through the outlet 5, see Fig. 1.

I claim In a machine for reducing vulcanized rubber to powder, the combination, with a grinder and means for operating the same, of a movable member for feeding the, rubber against the grinder, means for holding the rubber against the feeding means, and means for imparting an intermittent movement in one direction to said feeding member, to compress the rubber during the feed movements of said member, and to permit its expansion when said member is idle, said feeding member being moved in the opposite direction by the expansion of the rubber, to withdraw the latter from contact with the grinder.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

THOMAS GARE. lVitnesses -Warmer. J. SKERTEN, GEORGE G. DOWNING. 

